Current noise in ac-driven nanoscale conductors

S. Camalet, J. Lehmann, S. Kohler und P. Hänggi

Phys. Rev. Lett. 90, 210602 (2003)

Preprint: arXiv:cond-mat/0212247

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The theory for current fluctuations in ac-driven transport through nanoscale systems is put forward. By use of a generalized, non-Hermitian Floquet theory we derive novel explicit expressions for the time-averaged current and the zero-frequency component of the power spectrum of current fluctuations. A distinct suppression of both the zero-frequency noise and the dc-current occurs for suitably tailored ac-fields. The relative level of transport noise, being characterized by a Fano factor, can selectively be manipulated by ac-sources; in particular, it exhibits both characteristic maxima and minima near current suppression.

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